Cancels one or more Spot Instance requests. Spot Instances are instances
that Amazon EC2 starts on your behalf when the bid price that you
specify exceeds the current Spot Price. Amazon EC2 periodically sets the
Spot Price based on available Spot Instance capacity and current Spot
Instance requests. For more information, see
Spot Instance Requests
in the Amazon Elastic Compute Cloud User Guide.

Canceling a Spot Instance request does not terminate running Spot
Instances associated with the request.

Request Lenses

Checks whether you have the required permissions for the action, without
actually making the request, and provides an error response. If you have
the required permissions, the error response is DryRunOperation.
Otherwise, it is UnauthorizedOperation.